<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>findIndex方法</title>
  </head>
  <body>
    <script type="text/javascript">
      let ary = [10, 20, 50];
      // let index = ary.findIndex(item => item > 15);
      // console.log(index)
      let index = ary.findIndex((i) => i > 40);
      console.log(index);
    </script>
  </body>
</html>
